Band saw blade scraper



April 10, 1956 H. D. BRAUN 2,741,281

BAND sAw BLADE scRAPER Filed Feb. 7, 1952 2 sheets-sheet 1 nventorHERBERT a @HAU/v www fw/Wma (Ittomeg April 10, 1956 H. D. BRAUN BAND SAWBLADE SCRAPER 2 Sheets-Sheet 2 Filed Feb. 7, 1952 snventr HERBE/Q 7.BRAUN MMU Gttornegs 'tiene 1.

BAND SAW BLADE SCRAPER Herbert D. Braun, Toledo, Ohio, assigner to'ifoiedo Scale Company, Toledo, hio, a corporation o New derseyApplication February 7, 1952, Serial No. 270,452

3 Claims. (Cl. 143-158) slidably mounted to facilitate maintenance ofequal prese sure on both sides of the blade during any sidewise movementof the blade.

A further object is to provide resilient band saw blade Scrapers whichare maintained in contact with the sides of the blade at all times toscrape clinging materials therefrom.

A still further object of this invention is to provide a combinationblade cleaner and guide which can be removed and replaced as a unit.

It is still another object of this invention to provide band saw bladecleaning and guiding means which permit a limited amount of sidewisemotion of the blade without creating excess tension in the blade.

Other objects and advantages will be apparent from the followingdescription, in which reference is had to the accompanying drawings.

According to the invention, as a band saw blade carrying tallow, bonedust, meat particles, etc., moves downwardly through an aperture in thetable supporting the article being cut, a pair of slidably mountedresiliently iased Scrapers engaging the sides of the blade, scrape thetallow, etc., therefrom. The Scrapers in combination with a horizontallyadjustable thrust bearing aid in guiding the blade around a lower of twosaw wheels.

In the drawings:

Figure I is an elevational view of a band saw machine embodying theinvention.

Figure il is a sectional view illustrating the means for fastening thescraping and guiding unit to the machine, parts being broken away.

Figure lll is a fragmentary elevation of the adjustable scraping andguiding unit illustrating its position relative to the path of movementof the saw blade.

Figure 1V is an isometric view of the adjustable scraping and guidingunit.

Figure V is an isometric View of the guide block illustrating the methodby which the scraping and guide unit may be adjusted.

Figure VI is a View taken along line VI-VI of Figure Ill showing theslidably mounted resiliently biased blade Scrapers.

The meat cutting band saw illustrated in Figure I has a base housing 1which is erected on four short closed legs 2, and to which is attached,by means of forwardly extending brackets 3, a runway 4 on which ismounted a reciprocable table 5. The top of the housing 1 is formed by astationary table 6 which lies in the same plane as the reciprocabletable 5. Together, the tables and 6 form a working surface forsupporting meat to be cut on the machine.

An upright column 7 surmounts the rear center portion States ,arent r"ceof the housing 1 and enlarges at its upper limit tobecome an overhanginghead 8, thereby forming a throat between the underside of the head S andthe table 6. A continuous band saw blade 9 passes vertically downward inthe throat space around a lower saw wheel- 10 driven by a motor 11 inthe housing 1, then upwardly around an upper saw wheel 12 journaled inthe headl An aperture 13 is provided in the table 6 to provide apassageway for the blade 9. Located beneath the table substantiallyalong the path of the blade is an adjustable combination scraping andguidingV unit 14 which is held in place by a locking screw 15 threadedinto a guide block 16 of the unit 1d. A pair ot pins 17 iixed to theblock 16 engage in holes drilled in a frame portion 1S of the housing 1,thereby assuring correct positioning of the block 16 andv unit 14 at alltimes- The locking screw 15 is journaled throughV the frame portion 18and has a knurled thumb nut 19 manually operable from the exterior ofthe machine. The unit 14 can therefore be installed or removed simply bytightening or loosening the thumb nut 1Q.

A horizontally slidable bar 2t) is movable in a direction perpendicularto the cutting edge of the blade 9 by means of rotating a thumb screw 21journaled in an end portion 26a of the bar Zit bent at right angles tothe major portion of the bar. The screw 21 is threaded into theremovably mounted guide block 16- i'astened to the frame. portion 18.rlightening or loosening the screw causes it to move toward or away fromthe guide block, and thereby positions the bar 20' accordingly. TheV bar2S' is provided with a slot 22 the ends of which act' to limit travel ofthe bar, said ends being arranged to engage the pins 17 protrudingthrough the bar.. It will be noticed that theslot Z2 is longer than thedistance betweenV the pins, and the diameter of the pins 17 is slightlysmaller than the width of the slot 22.

The slidable bar 20 is guided in a milled-out portion 23 of the guideblock 16, the depth of which is substantially the same as the thicknessof the bar, thereby necessitating loosening the locking screw 15 toallow adjustment of the thumb screw 21 to correctly position the unit14. This eliminates the possibility of movement of the unit 14 due toplay caused by wear in any of the adjustable parts once the unit hasbeen adjusted and the locking screw 15 has been tightened.

The slidable bar 20 has its other end portion 2Gb bent at a right angleto support a thrust bearing 24 mounted on a short shaft Z5 held in ahole drilled in the bent end portion Zilb of the bar 29. The shaft 25 issecured to the bar 20 by means of a C-shaped spring retainer clip 26engaged in a turned-down neck portion ofl the shaft 25'. The thrustbearing 24 is provided with a stainless Steel cap 27 against which theback edge of the blade 9 bears. The axis of the bearing 24 isperpendicular to the cutting edge of the blade 9 and is offset slightlyfrom the path of the blade as shown in Figure il to allow the bearing torotate more freely as the blade bears against it.

Spot-welded to the bent end portion 2tlb of the bar 26 is asubstantially triangular inverted pyramidal-shaped bracket 28 with aninclined portion 2da having a threesided slot 29 through which the blade9 passes. A blade scraping mechanism 3b is slidably mounted on theunderside of the inclined portion 28a of the bracket 2S and consists ofa pair of Scrapers 31 laterally contacting the sides of the blade 9 andinclined downwardly toward the cutting edge of the blade, a pair ot'guides 3?. xed to the underside of the bracket in which the Scrapers 31are lateraily slidable with respect to the path of movement of the blade9, and a U-shaped resilient member 33 the arms of which are fastened tobent portions 34 of the Scrapers 31. The Scrapers are biased inwardly bythe arms of the 3 Y L member 33 to maintain the Scrapers in contact withthe sides of 'the blade 9 Without changing the pressure between theScrapers and the blade during any sidewise movement of the blade.

By constructing a blade scraping mechanism that has Scrapers which areboth'resilientlyf biased and laterally slidable with respect to thesides of the blade, the adverse effect ofY creating too much pressure onone side of the blade during any sidewise movement of the blade has turein the tableythe blade being mounted for sidewiseY movement in theaperture, an adjustable member Vmounted along the path of movement Vofthe blade, there beingV a slot in the member aligned with the aperturein the work table andthrough which the blade passes, the slot beingwider'than the thickness of the blade to permit sidewise movement of theblade, a pair of Scrapers located at the sides of the blade to cleanmaterial therefrom, guides fastened to the adjustable member and inwhich the Scrapers are laterally slidable toward and away from the sidesof the blade, a projection on each of the Scrapers remote from theblade, and a U-Shaped resilient member extending around the back edge ofthe blade with its ends fastened to the projections on the Scrapers, theresilient member being arranged to maintain the Scrapers inconstantcontact with the sides of the blade during sidewise movement ofthe blade.

, 2. In a meat cutting band saw having a work table, in combination, aband Saw blade running in a plane perpendicular to the table andpassingY through anaperture in the table, the blade `being mounted forsidewise movement Yin the aperture, a pair of blade scrapers mountedValong the path of movement of the blade, a pair of guidesV extendinglaterally toward the sides of the blade in which the Scrapers areslidable toward and away from the Sides Voi the blade, -the guideshaving their inwardly directed Y ends spaced to permit sidewise movementof the blade, and a resilient member Substantially surrounding the bladeand the Scrapers and having its ends fastened to the Scrapers to'maintain the Scrapers in constant contact with the sides of the bladeduring sidewise movement ofthe blade. p

3. In a meat cutting band saw having a work table, in combination, acontinuous band Saw blade running in a plane perpendicular to the tableand passing through an aperture in the table,-the blade being mountedfor sidewise movement in the aperture, a pair of blade Scrapers arrangedto engage the sides of the blade to scrape clinging material therefrom,VYguides in which thescrapers are laterally slidable toward and awayfrom the sides of the Y blade, andV a U-shaped resilient membersubstantially Sur- Y rounding the blade and the Scrapers and having itsends fastened to the Scrapers to maintain them in constant contact withVthe sides of the Vblade. before and during sidewise movement oftheblade. Y Y

References Cited in the file of this patent UNITED STATES PATENTS LasarOct. 30, 1951 spur-muy 4

